Closed hot-air heating system



1579,23@ ET AL April 6 1926.

T. F. MEINHARDT CLOSED HOT AIR HEATING SYSTEM Filed March 27, 1924 V EN TORS gel-1?@ A TTORNE YS v WITNESSES Patented Apro 5, 1929,.

're sr res F l Q THEODORE F. MEENHARD'I, GEORGE IRVING RAY, AND GLBEBT Gr. RAY, OF

CHARLOTTE, I Q'GRTH CARQLINA.

HEATING SYSTEM.

Application led March 27, 1924, Serial No. 702,373.

'To all wlw/zn t may concern.' Y

Be it known that we, nncnonn F. Murn- HARn'r, Grenen l. RAY, and Gunnar G. RAY, citizens of the United States, and residents of Charlotte, in the county of Mecklenburg and State of North Carolina, have made certain new and useful Improvements in a Closed Hot-Air Heating System, of which the following is a specification.

@ur present invention relates generallyto heating systems and more particularly to heating systems for dwellings and homes, our object being' the provision of an arrangement constituting a closed hot air heating system which will do away with the disadvantages of the usual hot air systems, wherein cold air is continuously taken into the same heated and delivered in a heated condition to the room or rooms where it is desired, and requiring, as it does, a large furnace and the-expenditure of a correspondingly large amount of coal or other fuel. According to our invention we propose the use of hot air in a closed system and its delivery to the point of use within a closed radiator, the saine air being heated over and over again in a furnace which is closed except for its communication with the circulating pipe or pipes to the radiator, and which need be but a fraction of the size of the usual hot air furnace, with the resultant economy in the necessary fuel.

Our invention thus utilizes hot air in a system somewhat similar to a hot water system, but without the disadvantages of handling the waterland with a quicker and more constant circulation of' greater efficiency.

ln the accompanying drawing which illustrates our present invention and forms a part of this speciication:

Figure 1 is a sectional view, more or less diagrammatic, illustratingthe practical application of our system;

Figure 2 is a partial verticallongitudinal section on an enlarged scale through the radiator shown in Figure 1;

4ignre 3 is a vertical longitudinal section through a slightly modifi-ed form of radiator' Figure 1 is an end view thereof, and,

Figure 5 is a partial horizontal section therethrough taken substantially on line `5 5 of Figure 3.

Referring now to these figures, and par ticularly to Figure 1v, our invention con templates the use ot a furnace generally indicated at 10, having its fire pot 11 outletting through a llue 12 and having a vertical cylindrical drum 13 located between and in spaced relation to the lire pot 11 and the outer wall of the furnace, the upper edge of which extends upwardly into a circulating flue 14; intended to afford both an upward passage for the heated air as indicated by the arrows 15, and a downward passage for the air from which the heat has been radiated as indicated by the arrows 16.

The extreme lupper end of the flue iet, wiose lower end thus communicates both with the annular space 17 around the upright drum 13 and with the annular space 18 between this drum and the tire pot 11, opens into a vertical double pipe 19, and below its upper end this flue opens into the lower end of a second vertical pipe 20, the latter providing for the upward passage of the heated air from the space 18 within the furnace toa radiator 21.

The lower endof the drum 13 is spaced from the base of the furnace so that the annular spaces 17 and 18 are in communication at their lower ends, the air from which the heat has been radiated descending through pipe 19 and along the lower portion of the circulating flue 141 to the space 17 from the lower end of which it passes into the space 18 where it is again heated by virtue of its close proximity to and around the lire pot 11 for subsequent passage upward along the upper portion of the flue 14, and through the radiator supply pipe 2O again to the radiator 21.

rllhe radiator 21 may as shown in Fig. 1, be formed with a plurality of upstanding hollow sections 22 spaced from one another, the lower ends of certa-in of which are in communication with the upper end of the supply pipe 20. r1`hese sev-eral sections of the radiator which is formed in its entirety of light sheet metal, are in communication through short horizontal tubes 28. Moreover, the lower portions of certain of the sections of the radiator are in communication with the upper end of the outer pipe 19 so that when the heat has been radiated from the air, the latter descends and thus a constant circulation is maintained of the same air which is continuously re-heated and reused., thus avoiding the cooling eect upon the furnace of the intake of cold air as in the usual hot air heating systems.

It is quite obvious that in view of the use ot hot air in a closed system of this charac ter ive are able to utilize the radiators havinfcT thin walls, ivhereby the heat ot the air therein may be quickly and eifectively radiated into the space Where itis desired and it is obvious that tor the purposes or our invention a radiator such as indicated in Fig;- ures 3, and 5 may be employed in lieu ot that illustrated in Figures l and 2. rthe radiator ot Figures 3, l and 5 contemplates the use ot opposed headers 2l and Q5 atv the uppa ends et the supply and outlet pipes 26 and 2T, these headers being connected by upstanding' spaced holloiv sections or cross members 2S through which the air passesl from the header 2l to the header 25.

Irrespective of the particular form of the radiator', however, it is obvious that our invention provides a hot air heating system which is superior to the usual hot air heating' systems,` which vvill he simple and durahlc, and which vvill also all'ord the advantages ot high etlicienei' alongl with economy both in first cost and upkeep.

l. A closed hot air heating,T system includingl a hot air furnace, an air circulating flue rising therefrom, a radiator having air supply and outlet pipes in communication with the said air circulating tlue at spaced points in the length ot the latter, and a drum in the air heating space of the furnace dividing the same into separate air spaces in communication 'with one another at the lower portion of the furnace, and in communication at their upper ends vvith the said air circulating Hue.

2. A closed hot air heating system ineluding` a furnace, a ljacket around the turnace, an air circulating ilue rising' 'from the jacket, a radiator having` air supply and outlet connections in communication with the said air circulating flue at spaced points along; the latter, and a drum around the furnace and Within the jacket and forming separate air spaces in communication ivith one another at the lovrcr portion of the furnace, a portion ol the said drum extending into the said air circulating flue whereby to place the said air spaces separately in communication at their upper ends with the said air circulating tine.

THEODQRE F. MENIALXRDT. GEORGE IRVING RAY. GILBERT G. RAY. 

